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3 years ago

What element forms an ion with an electronic configuration of [kr] and a –2 charge?

2 answers:

8 0

Must be Selenium (Se). It is two space away from Kr, which means that it needs two extra electron to be like a noble gas, Kr.

nekit [7.7K]3 years ago

6 0

Must be Selenium (Se). It is two space away from Kr, which means that it needs two extra electron to be like a noble gas, Kr.

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Antimony is burned in oxygen to form antimony oxide.

Zinaida [17]

The number of mole of S₂O₃ produced from the reaction is 13.33 moles

<h3>Balanced equation </h3>

4Sb + 3O₂ —> 2S₂O₃

From the balanced equation above,

3 moles of O₂ reacted to produce 2 moles of S₂O₃

<h3>How to determine the mole of S₂O₃ produced </h3>

From the balanced equation above,

3 moles of O₂ reacted to produce 2 moles of S₂O₃.

Therefore,

20 moles of O₂ will react to to produce = (20 × 2) / 3 = 13.33 moles of S₂O₃.

Thus, 13.33 moles of S₂O₃ were obtained from the reaction.

Learn more about stoichiometry:

brainly.com/question/14735801

6 0

2 years ago

Electric current where all of the electrons flow in one constant direction <br>

Likurg_2 [28]

An electric current that flows continuously in a single direction is called a direct current

5 0

3 years ago

A 812 g drinking glass is filled with a hot liquid. The liquid transfers 7032 J of energy to the glass. If the temperature of th

JulijaS [17]

Answer:

0.3936 J/gC

Explanation:

using the formula: q=mcΔt

q= 7032J

m=812g

ΔT = 22C

plug in and solve:

7032=(812)(c)(22)

c=7032/(812)(22)

c=0.39 J/gC

7 0

3 years ago

Define atmosphere and whats in it

Paraphin [41]

The atmosphere is a mixture of gasses that surrounds a planet, moon, or other celestial body

3 0

3 years ago

Read 2 more answers

How many molecules of carbon dioxide are dissolved in 0.550 L of water at 25 °C if the pressure of CO2 above the water is 0.250

Grace [21]

<u>Answer:</u> The number of molecules of carbon dioxide gas are $2.815\times 10^{21}$

<u>Explanation:</u>

To calculate the molar solubility, we use the equation given by Henry's law, which is:

$C_{CO_2}=K_H\times p_{CO_2}$

where,

$K_H$ = Henry's constant = $0.034mol/L.atm$

$C_{CO_2}$ = molar solubility of carbon dioxide gas

$p_{CO_2}$ = pressure of carbon dioxide gas = 0.250 atm

Putting values in above equation, we get:

$C_{CO_2}=0.034mol/L.atm\times 0.250atm\\\\C_{CO_2}=8.5\times 10^{-3}M$

To calculate the number of moles for given molarity, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$

Molarity of carbon dioxide = $8.5\times 10^{-5}M$

Volume of solution = 0.550 L

Putting values in above equation, we get:

$8.5\times 10^{-3}M=\frac{\text{Moles of }CO_2}{0.550L}\\\\\text{Moles of }CO_2=(8.5\times 10^{-3}mol/L\times 0.550L)=4.675\times 10^{-3}mol$

According to mole concept:

1 mole of a compound contains $6.022\times 10^{23}$ number of molecules

So, $4.675\times 10^{-3}$ moles of carbon dioxide will contain = $(6.022\times 10^{23}\times 4.675\times 10^{-3})=2.815\times 10^{21}$ number of molecules

Hence, the number of molecules of carbon dioxide gas are $2.815\times 10^{21}$

3 0

3 years ago

Read 2 more answers